body {
  display: flex;
  flex-direction: column;
}
header {
  width: 100%;
  height: 44px;
  border-bottom: 1px solid #ccc;
  display: flex;
}
header .option {
  flex: 1;
  text-align: center;
  line-height: 44px;
  font-size: 16px;
  color: #888;
}
header .pitch {
  font-size: 18px;
  color: #0056c7;
  border-bottom: 2px solid #0056c7;
}
#mainbox {
  overflow-y: scroll;
}
main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: #fff;
}
main .course {
  width: 95%;
  min-height: 200px;
  display: flex;
  flex-direction: column;
  background: #fff;
}
main .course .txt {
  line-height: 30px;
  flex-shrink: 18px;
  margin: 10px 0;
}
main .course .recommendCourse {
  width: 100%;
  height: 100%;
}
main .course .recommendCourse .img {
  margin-bottom: 30px;
  width: 100%;
  height: 230px;
  background-size: cover;
  box-shadow: 1px 1px 5px 0 #000;
  border-radius: 15px;
  overflow: hidden;
  position: relative;
}
main .course .recommendCourse .img img {
  width: 100%;
  height: 150px;
}
main .course .recommendCourse .img .texts {
  width: 100%;
  height: 60px;
  background: rgba(255, 255, 255, 0.8);
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 0 5px;
  font-size: 14px;
}
main .course .recommendCourse .img .texts .txtTop {
  font-size: 18px;
}
main .curriculum {
  width: 95%;
  min-height: 150px;
  display: flex;
  flex-direction: column;
  background: #fff;
}
main .curriculum .curriculumtxt {
  line-height: 30px;
  flex-shrink: 18px;
  margin: 10px 0;
}
main .curriculum .listcourse {
  width: 100%;
  height: 100%;
}
main .curriculum .listcourse .img {
  margin-bottom: 30px;
  width: 100%;
  height: 230px;
  background-size: cover;
  box-shadow: 1px 1px 5px 0 #000;
  border-radius: 15px;
  overflow: hidden;
  position: relative;
}
main .curriculum .listcourse .img img {
  width: 100%;
  height: 150px;
}
main .curriculum .listcourse .img .texts {
  width: 100%;
  height: 60px;
  background: rgba(255, 255, 255, 0.8);
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 0 5px;
  font-size: 14px;
}
main .curriculum .listcourse .img .texts .txtTop {
  font-size: 18px;
}
